import _00GraphFuc as gf
import _00GraphTreeFuc as gt

#12.2.2判断是否是树
m=20
[V,E]=gt.createtree(m)
tv=gt.istree(V,E)
gf.drawgraph(E)
print("V",V,len(V))
print("E",E,len(E))
print(tv)